The Cambrian Railways 4-4-0 locomotives consisted of five tender locomotive classes introduced between 1878 and 1921. Three of them were designed for the Cambrian Railways and supplied new, the fourth class was rebuilt from 4-4-0 tank locomotives, and the fifth consisted of secondhand purchases. Altogether 37 4-4-0 locomotives were owned by the Cambrian at one time or another, of which 35 passed to the Great Western Railway (GWR) at the start of 1922. The last was withdrawn in 1933.
In addition there was a class of six 4-4-0 tank locomotives introduced in 1905, four of which were not rebuilt as tender locomotives. They all passed to the GWR, and the last were withdrawn in 1923.
None of these locomotives were preserved, but another locomotive from the same class as the six 4-4-0 tank locomotives was preserved.